JSON响应中NSDictionary内的对象数组-目标c

Posted 2023-03-04

【中文标题】JSON响应中NSDictionary内的对象数组-目标c

【英文标题】：array of objects inside NSDictionary in JSON response - objective c

【发布时间】：2016-02-03 08:25:44

【问题描述】：

我正在尝试从NSDictionary 的 JSON 响应中获取对象列表，然后将其存储在 NSMutableArray 中，但它一直只给我数组中的一个对象，请您帮我提供示例代码，

这是 json 响应：

  "errorCd": "00",
  "desc": "Success",
  "ref": 83,
  "statusCode": "1",
  "extraData": [
    
      "key": "bal",
      "value": "80"
    ,
    
      "key": "txs",
      "value": "[\"id\":2268099999,\"amnt\":100.0,\"curr\":\"JOD\",\"sender\":\"PSPCI\",\"receiver\":\"00962799999992\",\"date\":\"Feb 1, 2016 4:03:25 PM\",\"status\":1,\"type\":5,\"fees\":0.0,\"reference\":40,\"id\":2357099999,\"amnt\":20.0,\"curr\":\"JOD\",\"sender\":\"00962799999992\",\"receiver\":\"PSPCI\",\"date\":\"Feb 2, 2016 12:52:35 PM\",\"status\":1,\"type\":6,\"fees\":0.0,\"reference\":68]"
    
  ]

我正在尝试获取键 txs 的值中的列表。

这就是我想要做的：

-(NSDictionary *)getListOfExtraData:(NSMutableArray *)extras
    NSDictionary *array = [[NSDictionary alloc] init];
    for (NSDictionary *dictionary in extras) 
        if([[dictionary valueForKey:@"key"] isEqualToString:@"txs"])
            array = [dictionary objectForKey:@"value"];
    
    if (array != nil && array.count > 0)
        return array;
    return nil;

【问题讨论】：

根据响应，该值看起来像是一个字符串，而不是一个数组。我记得它必须是这样的 ["A", "B"] 不带引号。

【参考方案1】：

JSON 数据无效，因为value 在" 中有一个对象

你应该像这样发送你的 JSON

  "errorCd": "00",
  "desc": "Success",
  "ref": 83,
  "statusCode": "1",
  "extraData": [
    
      "key": "bal",
      "value": "80"
    ,
    
      "key": "txs",
      "value": [
        
          "id": 2268099999,
          "amnt": 100.0,
          "curr": "JOD",
          "sender": "PSPCI",
          "receiver": "00962799999992",
          "date": "Feb 1, 2016 4:03:25 PM",
          "status": 1,
          "type": 5,
          "fees": 0.0,
          "reference": 40
        ,
        
          "id": 2357099999,
          "amnt": 20.0,
          "curr": "JOD",
          "sender": "00962799999992",
          "receiver": "PSPCI",
          "date": "Feb 2, 2016 12:52:35 PM",
          "status": 1,
          "type": 6,
          "fees": 0.0,
          "reference": 68
        
      ]
    
  ]

【讨论】：

如果 OP 无法控制 JSON 编码怎么办？

json 对象响应一般包含任何键值对象，并利用值放置我们需要的任何值对象或字符串或数组

【参考方案2】：

好吧，我会说 JSON 是不寻常的；看起来它可以是字符串化的数字 ("80") 或 JSON 数组。

你需要进一步解析内部数组，用：

NSData *jsonResponse = ...;    // Response from server
NSError *error = nil;
NSDictionary *topLevelDict = [NSJSONSerialization JSONObjectWithData:jsonResponse
                                                             options:0
                                                               error:&error];
if (topLevelDict) 
    NSArray *extraData = topLevelDict[@"extraData"];
    for (NSDictionary *innerDict in extraData) 
        if ([innerDict[@"key"] isEqualToString:@"txs"]) 
            NSString *valueStr = innerDict[@"value"];
            NSArray *innerArray = [NSJSONSerialization JSONObjectWithData:[valueStr dataUsingEncoding:NSUTF8StringEncoding]
                                                                  options:0
                                                                    error:&error];
            if (innerArray) 
                // FINALLY!  WE HAVE IT!
             else 
                // Report error
            
            break;
        
    
 else 
    // report error

【讨论】：

这个解决方案对我来说就像魔术一样，非常感谢，json响应是正确的，但是内部解析数组的想法！好主意，再次感谢你

【参考方案3】：

After the json is in correct format,i.e.



  "errorCd": "00",
  "desc": "Success",
  "ref": 83,
  "statusCode": "1",
  "extraData": [
    
      "key": "bal",
      "value": "80"
    ,
    
      "key": "txs",
      "value": [
        
          "id": 2268099999,
          "amnt": 100.0,
          "curr": "JOD",
          "sender": "PSPCI",
          "receiver": "00962799999992",
          "date": "Feb 1, 2016 4:03:25 PM",
          "status": 1,
          "type": 5,
          "fees": 0.0,
          "reference": 40
        ,
        
          "id": 2357099999,
          "amnt": 20.0,
          "curr": "JOD",
          "sender": "00962799999992",
          "receiver": "PSPCI",
          "date": "Feb 2, 2016 12:52:35 PM",
          "status": 1,
          "type": 6,
          "fees": 0.0,
          "reference": 68
        
      ]
    
  ]
  

要存储数组，您需要将变量 array 声明为 NSArray 或 NSMutableArray 而不是 NSDictionary